Introduction  HVD is an advanced optical disk that‟s presently in the development stage.  Storage capacity :- 1 terabyte (TB).  Data transfer rate :- 1 Gigabit per second.  The technology permits over 10 kilobits of data to be written and read in parallel with a single flash.3

Introduction  An HVD would be a successor to today‟s Blu-ray and HD- DVD technologies.  Advancements in the technology were made, in the early 21st century.  Developed by the „Holography Storage Development Forum‟  HVD can store up to 60 times the data of a regular DVD and it can read and write data 10 times faster as well.4

What is HVD ?  Definition:- Holographic versatile disc is a holographic storage format that looks like a DVD but is capable of storing far more data.  Prototype HVD devices have been created with a capacity of 3.9 terabytes (TB) and a transfer rate of 1 Gbps.  1 HVD = 5,500 CD-ROMs = 830 DVDs = 160 Blu-ray discs  Uses laser beams to store data in 3D.5

What is HVD ?6

Basics of Holographic Memory  Holography is a method of recording patterns of light to produce a 3D object.  The recorded patterns of light are called a hologram.  Creation of a hologram begins with a focused beam of light, a laser.  Laser splits up into 2 :-  Reference beam  Information beam7

Basics of Holographic Memory  When light encounters an image its composition changes.  When the information beam encounters an image, it carries that image in its waveforms.  When the two beams intersect, it creates a pattern of light interference and that can be recorded on the photosensitive polymer layer of a disc.8

Basics of Holographic Memory  To retrieve the information stored in a hologram, shine the reference beam onto the hologram. When it reflects off the hologram, it holds the light pattern of the image stored there.  This reconstruction beam is then send to a CMOS sensor to recreate the original image.9

Technology used in HVD  Collinear holography – The laser beams are collimated.  Blue-green laser reads the data encoded in the form of laser interference.  Red laser serves the purpose of reference beam and to read the servo info.  A layer of dichroic mirrors, between the holographic and servo data layer reflects back the blue-green laser beam, letting only the red laser pass through it to reach the servo information.10

Technology used in HVD  The concepts of collinear holographic memories are:  To increase the recording capacity, thick volume-recording media is used  The optical disk is pre-formatted with addresses and optical servo information  The beam for the optical servo is utilized to provide backward compatibility with the existing CDs or DVDs11

Writing data  Information is encoded into binary and is stored in the SLM.  These data are turned into ones and zeroes represented as opaque or translucent areas on a „page‟.  When the information beam passes through the SLM, portions of the light are blocked by the opaque areas of the page, and portions pass through the translucent areas.  When the reference beam and the information beam rejoin on the same axis, they create a pattern of light interference - the holography data.  This interference pattern is stored in the photopolymer area of the disc as a hologram.15

Writing data16

Writing data Page Data Hologram17

Reading data  To read, we‟ve to retrieve the light pattern stored in the hologram.  Laser is projected onto the hologram – a light beam that is identical to the reference beam .  The hologram diffracts this beam according to the specific pattern of light interference its storing.  The resulting light recreates the image of the page data that established the light-interference pattern – Reconstruction beam.  The reconstruction beam - bounces back off the disc, it travels to the CMOS sensor.  The CMOS sensor then reproduces the page data.18

Reading data19

Advantages, disadvantages and applications of HVD  Advantages :-  More storage  Reads and writes quickly  Price, expected to be slashed down  Disadvantages :-  Initial price of the player and disc are high.  Price and storage not confirmed, still in R&D.20

Advantages, disadvantages and applications of HVD  Applications:-  Used for storing large amounts of data most likely for large companies.  Could be the most efficient way to backup information in the near future.21

Facts  It has been estimated that the books in the U.S. Library of Congress, the largest library in the world , could be stored on six HVDs.  The pictures of every landmass on Earth - like the ones shown in Google Earth - can be stored on two HVDs.  With MPEG4 ASP encoding, a HVD can hold anywhere between 4,600-11,900 hours of video, which is enough for non-stop playing for a year.22

Future aspects  Have tremendous implications in the commercial, industrial and d-Cinema realms.  Will find wide use for backing up and archiving the media libraries, including the one at the Hollywood studios23

holography versatile disc ppt - seminarprojects.org

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